Accessory system for motor vehicles



Feb. 25, 1936.

H. HUEBER ET AL 2,032,321 ACCESSORY SYSTEM FOR MOTOR VEHICLES FiledMarch 9, 1952 2 Sheets-Sheet l glwue'ntow 21022235 liueber, Erwin ClHarlan.

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clam/M Feb. 25, 1936. H, HUEBER ET AL 2,032,321

ACCESSORY SYSTEM FOR MOTOR VEHICLES Filed March 9, 1932 2 Sheets-Sheet 235 gwuzntozs m Hen 2 1 Hzzeber,

Erwin CZ Horton.

UNITED STATES PATENT OFFICE ACCESSORY SYSTEM FOR MOTOR VEHICLES HenryHueber, Buffalo, and Erwin C. Horton,

Hamburg, N.

Y., assignors to Trico Products Corporation, Buffalo, N. Y.

Application March 9,

10 Claims.

The present invention relates to a fluid operated system for motorvehicle accessories.

Heretofore in the operation of certain automotive accessories it hasbeen customary to actuate such accessories by means of the difference inpressure between the atmosphere and the pressure obtaining within theintake manifold of an internal combustion engine. This source ofsuction, however, has been found to be directlydependent upon theposition of the throttle of the carburetor and therefore fluctuates overa rather wide range being at a maximum during those periods of operationwherein the throttle is closed or substantially closed, and decreasingrapidly as the throttle is opened, as for instance during high enginespeed or rapid acceleration of the speed of the engine. For theoperation of windshield cleaners and other fluid actuated automotiveaccessories, it is highly desirable that "the same maintain a definiteand uniform speed of operation regardless of the engine speed.

The instant device provides a system in which the source of supply forthe operating pressure has an operating'capacity which is whollyadequate and sutficient to meet the demands made on it by theaccessories.

In'the drawings appended hereto and made a part of this specification:

Fig. 1 is a side elevation of an automotive vehicle with parts brokenaway, showing the instant device attached thereto.

Fig. 2 is a substantially medial section through the instant device.

Fig. 3 is a section on the line 3--3 of Fig. 2.

Fig. 4 is a vertical section through a modification of the device, whileconnections therefrom to the intake manifold of an internal combustionengine and to the fluid pressure motor of a windshield wiper are showndiagrammatically.

Fig. 5 is another modification similar to that shown in Fig. 4.

Referring more particularly to the drawings an automotive vehicle I isprovided with an internal combustion engine II and an automotiveaccessory of any desired type, as for instance a windshield wiper I2.munication with means for supplying an operating pressure, such as thefluid pump |3, by means of the pipe or conduit 4. The conduit l4 may beclosed by a manual control valve l4 to stop the windshield cleaner, thelatter having its usual automatic valve action generally indicated atI2.

This pumpis desirably of the suction or neg- ,ative pressure type and isattached to the crank case of the engine in operative contact with Thisaccessory has fluid com- 1932, Serial No. 597,865

the cam shaft thereof for serving as mechanism for the pump.

The pump proper provides a pump housing with an inlet port It connectedand in fluid communication with the automotive accessory by a conduit l4for operating and actuating the device. The opening or port l6,providing such fluid communication, is provided with valving means I!which permits of unidirectional flow of fluid therethrough into the pumphousing. The 'port I6 is positioned adjacent the base plate |8 of thepump housing which is contiguous to and in contact with a portion H ofthe automotive vehicle, as for instance a side of the crank case.

Another port is positioned in the pump housing adjacent the front plate2| thereof and has fluid communication with the interior of the crankcase by means of the port 22 in the crank case and the passageway 23 ofthe pump casing, for reasons which will be more fully explainedhereinafter.

The back plate l3 of the pump housing is provided with an extension 24having an aperture therein which provides a bearing surface 25 for a rod26 which extends into the crank case to be operated by the cam shaft 21.The extension 24 is provided with a well portion 28, open at the upperend and in fluid communication with the interior of the crank casewhereby the lubricant contained within the crank case may, when splashedupon the crank case wall, flow into and be retained within the well.This construction serves desirably as a reservoir for lubricating fluidwhich will be carried along the bearing surface 25 of the extension 24and the piston rod 26 and find its way into the pump housing 5 and bedesirably returned to the crank case through the port 20 and passage 23.This oil acts as a desirable lubricant and keeps the piston in the pumphousing soft and pliable.

The pump member or piston 29 of the device is operatively secured to theforward end of the rod 26 by desirable securing means, as for instanceby means of the rivet 30.

The piston 29 is composite in structure, being provided with a backplate 3| with an aperture 32 therein. A flexible cup packing 33 is alsoprovided and placed adjacent to the plate 32 in such fashion as to haveits flange bear against the wall of the piston chamber. Apertures 34 areformed in this flexible composition or fabric in staggered relation tothe aperture 32 formed in the back plate 3|. A forward securing plate 35is placed upon the fabric 33 and the three plates 3|, 33 and 35 are allheld in tightly assembled a driving posite piston 29..

relation by means of the rivet 30, The forward plate 35 is provided withapertures 36 which are substantially concentric with the apertures 32 inthe back plate 3| and has suflicient radius to include therein thestaggered apertures 34 within the fabric portion 33 of the compositepiston.

Upon movement of the engine of the automotive vehicle the cam member 21will cause the rod 26 to move the piston in a direction toward the faceor forward plate 2| of the pump housing l5, and the resilient member 38having bearing contact upon the composite piston 29 will cause the sameto move in the opposite direction and retain bearing contact upon thecam member 21. This resilient member 38 is retained in substantiallycentered relationship with the piston by means of a centering knob 39formed in the face plate 2|, or is retained thereon in other desired andsuitable fashion.

From the above description of this mechanism it will be clearly seenthat upon the movement of the piston toward the base plate 2| fluid willbe drawn into the pump housing through the conduit |4 while fluid willbe expelled or urged out of the pump housing through the port 20 andpassage 23 into the crank case and so to the atmosphere or to the intakemanifold when connected thereto, as will be hereinafter described. Uponmovement of the piston in the opposite direction the valving means llprevent free fluid communication between the pump housing and theconduit l4 and movement of the fluid therefrom. A certain fluid pressurewill be built up within the pump housing and the piston 29 and willforce the flexible packing 33 away from the back plate 3| and permitsuch fluid to flow between the back plate and the packing member throughthe staggered apertures 34 and into the forward portion of the pumphousing between the piston 29 and the face plate 2|, whereupon suchfluid will be ejected from the pump housing upon reversal of the strokeof the piston. The cup packing 33 is further adapted to permit thepassage of a certain amount of fluid between its peripheral flange andthe wall of its chamber formed within the pump housing l5 when a toogreat pressure is produced therein.

It is thus seen that the instant device will provide a fluid pumpingmechanism whose capacity is directly dependent upon the speed of theengine by which it is actuated; which will permit controlled passage offluid therethrough in one direction; and one which will remain flexibleand not check or crack with continued use.

A type of the flexible valved piston pump, used in conjunction with thepressure drop within an intake manifold of an internal combustionengine, is shown in Fig. 4 with a modification of the device foractuating the windshield cleaner.

The passageway 6| in the pump housing is in fluid communication with thecylinder deflned by the housing 46, under certain conditions ofoperation, through the port 65 which is positioned in the pump housingbetween the face plate 45 and the forward limit of movement of the com-Thus, when the pressure within the manifold of the internal combustionengine is sumciently low for operating the automotive accessory at thedesired speed the differential pressures within the auxiliary cylinder51 are suflicient to cause movement of the piston 59 against theresilient means 60 whereby the piston rod 62 is moved from the positionshown in Fig. 4 and permits fluid communication between the passageway6| and the portion of the pump housing between the face plate 45 and thecomposite piston 29. Thus, fluid is permitted to flow from the pumphousing, or passage 55, upon the forward movement of the compositepiston-29 into the passageway 6|. This fluid, or a portion of it, mayagain enter the cylinder chamber through the port 48 and thence .to theother side of the composite piston 29 thus permitting a by-passingaction upon reciprocation of the piston 29 under the influence of thecamming action of the moving portion 43 of the internal combustionengine. It will thus be seen that the pump is ineifective to create asuction of greater degree than the minimum degree of suction which willcause opening of valved port 65, and further, that suction created inthe engine manifold, if greater than such minimum degree, will belowered to such degree by the entrance of atmospheric air through port55, the cylinder chamber, port 65, and passages 6|, 5|.

When the pressure drop within the intake manifold is insuflicient,however, to operate the accessory at the desired speed, the resilientmeans 60 move the piston 59 to the position shown in Fig. 4 whereby theby-passing action is eliminated as the port 65 is closed by the pistonrod 62. Under these conditions of operation, reciprocation of thecomposite piston 29 causes fluid to flow through the passageway 55 intothe crank case thereby causing fluid to be drawn through the conduit 5|into the piston housing 46. Upon the reversal of the stroke of thecomposite piston, under the influence of the resilient means 44, anyfluid pressure built up between the back plate 49 of the pump housingand the composite piston 29 is caused to pass through the compositepiston as described hereinabove, since the valving means 56 preventpassage of fluid from the housing to the conduit 5 I.

Another modification of the device is shown in Fig. 5 wherein a pumphousing 46 is provided with a composite reciprocable piston 10, a pistonrod I operatively connected thereto and having bearing connection upon amoving part of the internal combustion engine, such as the cammingmember 43.

The face plate 12 of the pump housing is prodirection is produced bymeans of a pressure drop, I

as will be explained more fully hereinafter.

The composite piston member 10 comprises a back plate member I8 which isoperatively connected to a piston rod 1| in any desirable or suittablefashion, as for instance by means of the rivet head shown at 19. Theback plate member 18 is provided with ports therein which permit ofmovement of fluid therethrough under certain conditions of operation. Afront plate 8| is also provided as a portion of the composite piston 19the said platevhaving an offset portion 92 substantially centrallythereof which is provided with an aperture for permitting the passage ofthe piston rod 15 therethrough for communicating with the guidingchannel 16 formed in the piston rod 1|. The face plate 3| is alsoprovided with Plate 8| and held therebetween intightly assembledrelation in any desired fashionfas for instance by rivets 88, is aflexible packing member 81 having an apertured central portionpermitting of free and unimpeded passage of fluid to the apertures 88 ofthe back plate. This packing 81 also serves as a valve seating memberfor the valve plate 85, and thereby provides a tight piston member uponforward movement of the composite piston 18. These various plates areassembled in tight and compact relationship by any desirable methods, asfor instance by means of the 86 shown in the drawings.

Movement of the piston in the forward direction is caused by the urgingaction of the cam rivets member 43 and movement in the opposite direc-'tion is induced by means of the resilient member or spring 88 which hasbearing'contact against the face of the composite piston 18 and againstthe face plate 12 of the pump housing. In the disposition-illustrated inFig. 5 the resilient'member 88 surrounds and encloses the piston rod 15and is retained in place by means of the olfset 82 formed upon the faceplate 8| ofthe composite piston I8 and by means of a retaining member 89formed in the face plate I2 of the housing.

The operation of the pump mechanism will now beclearly understood sincethe camming member 43 causes forward movement of the rod II and thecomposite piston thus causing the valving plate 85 to seat upon theflexible fabric member 81 and form a tightly sealed piston which willurge fluid into the passageway 55 formed in the pump housing and intothe crank case through the port 22 formed in the side wall of theengine. The

return stroke of the piston is caused by the urging action of theresilient means 88 whereby the composite piston is moved toward thecrank case and any fluid pressure built up between the piston and theback plate 49 of the housing will move the valving means 85 and permitcontrolled flow of fluid through the ports 88 of the back plate I8 ofthe-piston and the ports 84 'of the front plate thereof.

A port 48 is provided in the pump housing between the back plate thereofand the composite piston I8 which is pfivided with valving means 58which permits flow of fluid-into the pump housing and prevents egress offluid therefrom.

When the device is used as a suction producing device in conjunctionwith the intake manifold of an internal combustion engine, the manifold41 is attached to a conduit 52 which in turn is in fluid communicationwith a conduit 5| attached to the pump housing 48 at the port 48. Theconduit 82is provided with valving means 54 therein which permit flow offluid toward the intake manifold 41 of the internal combustion enginebut which prevent fluid flow in the opposite direction. The conduit 52is further connected in fluid communication with an automotive accessory53 having a moving piston.

In this connection it may be noted that the pump discharges away fromthe intake manifold so as to avoid altering the combustible mixturetherein. Further, excess manifold suction will tend to hold the pumpinlet valve closed and be ineffective on the pump piston when thepressure in the manifold is lower than in the pump.

- Means are provided for moving the auxiliary piston I4 against theresilient means 11 by the use of a pressure drop. Fluid communication istherefore provided between the cylinder 13 and a convenient source ofsuction, as for instance between the intake manifold 4! and the cylinder13. Thus an opening 98 is provided in the cylinder 18 connected byconduit 8| to the conduit 52 from the intake manifold to the automotiveaccessory, thus insuring the production of a pressure drop in thecylinder I3.

' Under conditions of operation of the internal combustion enginewherein the pressure'drop in the intake manifold is quite suflicient tooperate the accessory at the desired rate, the piston I4 is urgedagainst the resilient means 11 thereby permitting free anduninterruptedoperation of the valving plate against the flexiblediaphragm '81 of the composite piston I8. Under such conditions ofoperation reciprocation of the composite piston 18 in a forwarddirection against the resilient means 88 causes fluid flow through thepassageway 55 formed in the pump housing, through the port 22 in theside of the crank case and into the crank case. Movement in'the oppositedirection is caused 'by the resilient means 88 and since the valvingplate 85 is not held tightly against the flexible membrane 85 by theshoulder 83 of the rod I5, fluid is caused to flow through the ports 88of the back plate and into the forward compartment of the pump.

Under operating conditions where an insufficient pressure drop obtainswithin the intake manifold there is an insufficient suction in thecylinder 13 to move the cylinder against the urging action of theresilient means I1, in consequence whereof, the shoulder 83 of the rodI5 urges the valving plate tightly against the flexible member 8! andforms a fluid tight piston and intensifies the suction. in the conduit52.

From the foregoing it will be observed that the pump is given a parttime functioning, the same coming into function when the manifoldsuction is insuflicient of itself to operate the cleaner. When themanifold suction is sufficient to operate the cleaner the pump will idleby reason of the by-pass arrangements in Figs. 4 and 5, or by reason ofthe inlet valve H in Fig. 2 being held to its seat by the lower pressureon the windshield cleaner side thereof.

What is claimed is:

' 1. A pump for exhausting fluid from a conduit, said pump comprising acasing having a cylinder, a check valved connection from the conduit tothe cylinder, 9. piston in said cylinder permitting uni-directionalfluid flow therethrough, a second cylinder on said pump casing, a pistonin said second cylinder having a rod controlling the passage of fluidthrough said first piston, resilient means'for moving said second pistonin one direction, and fluid connection with said conduit to said second.cylinder for moving said second piston against said resilient means.

2. In a fluid pump for being actuated from the cam shaft of a motorvehicle engine, a cylinder adjacent the engine crank case, a rod mountedfor reciprocation in the end of the cylinder by the engine cam shaft, apiston secured to the rod and reciprocal in the cylinder, said pistondivid ing the cylinder into an inner chamber adjacent the crank case andan outer chamber, a spring.

in said outer chamber for moving the piston to restrict said innerchamber and to retain the rod against the cam shaft, said piston havingan aperture therethrough and a valve member in said outer chamberadapted to seat over said aperture, a valved fluid inlet passage intosaid inner chamber, and an unvalved fluid outlet passage from said outerchamber into the engine crank case. 3. In a suction pump, a cylinder, apiston reciprocal in the cylinder and dividing the latter in twochambers, a valved inlet fluid passage in one chamber connecting thechamber to a suction conduit, an outlet fluid passage from the otherchamber, said piston having an opening therethrough, a valve in saidother chamber seating against the piston over said opening, asecondcylinder communicating with said other chamber, a second piston in saidsecond cylinder and connected to said valve, spring means for normallyholding the valve seated, and a passage connecting the portion of thesecond cylinder remote from said other chamber to said suction conduit,whereby a predetermined degree of suction in the suction conduit willcause said second piston to move to permit unseating of the valve.

4. In a suction pump, a cylinder, a piston reciprocal in the cylinderand dividing the latter into two chambers, a'suction conduit and avalved fluid inlet passage therefrom into one of said chambers, a fluidoutlet passage from the other chamber, a second and smaller cylinder, a.second 'piston in said second cylinder having a piston rod slidablyengaging the first piston, said first piston having an openingtherethrough, a valve in said other chamber for normally closing saidopening and carried by said piston rod, spring means for normallyseating the valve, and a conduit connecting the second cylinder (theportion thereof on the side of the second piston opposite from thevalve) to the suction conduit.

5. In afluid pump operable from a cam shaft 'of a motor vehicle engine,a cylinder, a piston in the cylinder having a piston rod reciprocated bythe cam shaft, said piston dividing the cylinder into two chambers, afluid conduit having a valved passage into one of said chambers, and anatmospheric vent in the other of said chambers, said piston having anopening therethrough, a fluid 1 effective when the pressure in saidconduit reaches a predetermined degree, whereby fluid may bypass saidpiston and prevent further pumping action thereof.

conduit and 'said'chamber, and valve means in said by-passage responsiveto fluid pressure in said portion of the conduit for opening and closingsaid by-passage when the degree of suction in said portion of theconduit respectively reaches predetermined maximums and minimums.

7. A pump for exhausting fluid from a suction conduit comprising acylinder and a piston dividing the cylinder into two chambers, a valvedfluid inlet passage to one chamber from the conduit, a fluid outlet fromthe other chamber, said piston having a valved passage therethrough topermit fluid to pass only from said one chamber to said other chamber, aby-passage connectingchamber and said conduit, a valve in said bypassage, and means responsive to the pressure in said conduit closingand opening said valve when the differential between the pressure insaid conduit and atmosphere respectively reaches a predetermined minimumand a predetermined maximum.

9. In a pump, a piston for passing fluid therethrough in one direction,comprising a flexible member having its periphery cupped for engagementwith a cylinder wall, the cupped portion of the flexible member beingyieldable to pass fluid thereby during movement of the pistonin onedirection, a rigid plate on each side of the flexible member andclamping the latter therebetween,

said plates having aligned apertures, and 'said' flexible member havingan aperture out of alignment with the aperture in one plate and alignedwith the aperture in the other plate, whereby the apertured portion ofthe flexible member may be bulged into the last mentioned aperture byfluid pressure to provide a passageway through the piston via theapertures.

10. In a pump, a piston for passing fluid therethrough in one direction,comprising a flexible member, a rigid plate on each side of the flexible3 member, one plate having an aperture and the other plate having aconcentric aperture of larger diameter, and the flexible member having aplurality of apertures in a zone lying between the peripheries of plateapertures.

HENRY HUEBER. t ERWIN C. HORTON.

